Articles | Volume 13, issue 5
https://doi.org/10.5194/bg-13-1367-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-13-1367-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
04 Mar 2016
Research article |
| 04 Mar 2016
Benthic phosphorus cycling in the Peruvian oxygen minimum zone
Ulrike Lomnitz
CORRESPONDING AUTHOR
GEOMAR Helmholtz Centre for Ocean Research Kiel,
Wischhofstr. 1–3, 24148 Kiel, Germany
Stefan Sommer
GEOMAR Helmholtz Centre for Ocean Research Kiel,
Wischhofstr. 1–3, 24148 Kiel, Germany
Andrew W. Dale
GEOMAR Helmholtz Centre for Ocean Research Kiel,
Wischhofstr. 1–3, 24148 Kiel, Germany
Carolin R. Löscher
GEOMAR Helmholtz Centre for Ocean Research Kiel,
Wischhofstr. 1–3, 24148 Kiel, Germany
Anna Noffke
Institut für Seenforschung (ISF) der LUBW, Argenweg
50/1, 88085 Langenargen, Germany
Klaus Wallmann
GEOMAR Helmholtz Centre for Ocean Research Kiel,
Wischhofstr. 1–3, 24148 Kiel, Germany
Christian Hensen
GEOMAR Helmholtz Centre for Ocean Research Kiel,
Wischhofstr. 1–3, 24148 Kiel, Germany
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Upwelling of nutrient-rich deep waters to the surface make eastern boundary upwelling systems hot spots of marine productivity. This leads to subsurface oxygen depletion and the transformation of bioavailable nitrogen into inert N2. Here we quantify nitrogen loss processes following a simulated deep water upwelling. Denitrification was the dominant process, and budget calculations suggest that a significant portion of nitrogen that could be exported to depth is already lost in the surface ocean.
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Nitrogen (N2) fixation is one of the most important nutrient sources to the ocean. Here, we report N2 fixation in the deep, dark ocean in the South China Sea via a highly sensitive new method and elaborate controls, showing the overlooked importance of N2 fixation in the deep ocean. By global data compilation, we also provide an easy measured basic parameter to estimate deep N2 fixation. Our study may help to expand the area limit of N2 fixation studies and better constrain global N2 fixation.
Gerd Krahmann, Damian L. Arévalo-Martínez, Andrew W. Dale, Marcus Dengler, Anja Engel, Nicolaas Glock, Patricia Grasse, Johannes Hahn, Helena Hauss, Mark Hopwood, Rainer Kiko, Alexandra Loginova, Carolin R. Löscher, Marie Maßmig, Alexandra-Sophie Roy, Renato Salvatteci, Stefan Sommer, Toste Tanhua, and Hela Mehrtens
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2020-308, https://doi.org/10.5194/essd-2020-308, 2021
Preprint withdrawn
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The project "Climate-Biogeochemistry Interactions in the Tropical Ocean" (SFB 754) was a multidisciplinary research project active from 2008 to 2019 aimed at a better understanding of the coupling between the tropical climate and ocean circulation and the ocean's oxygen and nutrient balance. On 34 research cruises, mainly in the Southeast Tropical Pacific and the Northeast Tropical Atlantic, 1071 physical, chemical and biological data sets were collected.
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Short summary
The study presents a P budget including the P input from the water column, the P burial in the sediments, as well as the P release from the sediments. We found that the P input could not maintain the P release rates. Consideration of other P sources, e.g., terrigenous P and P released from the dissolution of Fe oxyhydroxides, showed that none of these can account for the missing P. Thus, it is likely that abundant sulfide-oxidizing bacteria release the missing P during our measurement period.
The study presents a P budget including the P input from the water column, the P burial in the...
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